A polar bond is a covalent bond in which there is an electronegativity difference between the two bonded atoms and electrons are shared unequally. The atom with the higher electronegativity will have a partial negative charge and is marked with the symbol (δ-) while the atom with the lower electronegativity will have a partial positive charge and is marked with the symbol (δ+).
Although two atoms must exchange electrons in covalent bonds, the electrons are not always distributed equally. The evenness of electron sharing decreases as the difference in electronegativity between the atoms in a covalent connection grows. If electrons are distributed unevenly, they will frequently be located closer to one atom than the other.
A dipole is produced by this configuration, in which one atom in a covalent bond is slightly more negative and the other slightly more positive. A polar link is one in which the electrons are distributed unevenly.
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